Designer cardigans are having a louche layering moment this fall, and the point is to wear them with less precision than the usual neat knitwear formula. Louche layering is worth caring about because a cardigan can now do the work of a jacket, a blouse, or the thing that makes an ordinary trouser look intentional. I like the permission it gives you to leave a button undone, push up a sleeve, and let one layer show at the hem. My rule is to buy one controlled piece for every deliberately relaxed one. A big cardigan needs a clean trouser or a slim skirt underneath; a fine gauge style can take a fuller bottom and still look composed. I also separate the money into bands. Under four hundred dollars is where cotton, wool blends, and smaller labels can be very good. Between four hundred and eight hundred dollars I want cashmere, merino, or an unusually convincing knit. Above that, the cut and hand have to justify the expense, not just a famous name. Avoid anything so soft it loses its shape by lunchtime, and be suspicious of decorative detail that makes a cardigan difficult to layer. Below, the cardigans I would wear over almost everything, from quiet cashmere to the versions that make the outfit.

Allude understands that cashmere should feel generous without becoming fussy. The prices run from just under three hundred dollars to just over one thousand dollars, so there is room to test the label before committing to its most expensive knit. The cable knit cashmere cardigan is the one I would buy first, with enough texture to stand alone over a shirt. The v neck cashmere cardigan is the useful, lower-profile layer for dresses and high-waisted trousers. For a quieter shape, the cashmere cardigan does exactly what its name promises. I also like the striped cashmere cardigan because a little pattern makes louche layering look intentional rather than merely untidy.

Shop this group if you want a cardigan that can be the main event without becoming a costume. The claridges argyle cashmere cardigan gives a classic pattern enough softness to feel current, while the slouch merino wool cardigan has the relaxed line this trend needs. Toteme's jersey cardigan is the restrained option, especially when the rest of the outfit already has volume. At the more accessible end, the pointelle knit cotton jersey cardigan proves that a good layer does not need a luxury fibre. I would keep the proportions simple around these pieces, with a straight trouser or a narrow skirt doing the quiet work underneath.

Fine gauge cardigans are for anyone who wants layering without the bulk. They should sit close enough to slip under a coat, but not so close that the buttons pull when you reach for your bag. Thea cashmere cardigan is DÔEN's pretty, practical answer, while the cropped wool cardigan gives St. Agni's version a sharper waist. The edie open knit organic cotton cardigan is the easy daytime buy, and the james merino wool cardigan is the one I would choose for repeated office wear. The rule here is to keep the base layer thin and let the cardigan be the visible texture.

Chunky and embellished cardigans work when the surface has one clear idea. The rainger striped wool blend cardigan has enough stripe to carry jeans and boots without extra styling, while the danae cropped cable knit cashmere cardigan gives DÔEN's softer take a more defined shape. For actual decoration, the mlak bead embellished mohair alpaca and wool blend cardigan is the piece that turns a plain skirt into an outfit. The ezra ribbed jersey cardigan is the sensible counterweight, and the cropped striped ribbed knit cardigan is the high-drama choice. Wear one statement knit at a time and let the rest stay quiet.

The shopping list is for the pieces that refuse to sit neatly in one category but deserve the closet space. The twisted wool blend cardigan is Lemaire's thoughtful, slightly odd layer, the kind that improves a plain shirt. Chloé's logo embroidered wool cardigan is more recognisable, but still useful over denim. The axel cashmere cardigan is a serious purchase with the softness to justify it, while the haven knitted wool cardigan is the better everyday spend. I would also look at the compact hooded ribbed brushed alpaca blend cardigan for weekends and the mini marina cropped striped cotton cardigan when the outfit needs a shorter line.

Cardigans are forgiving, but the shoulder still matters. If the seam drops too far, a soft knit can make every layer underneath look accidental, so try it on over the shirt or dress you expect to wear most. Cashmere deserves a rest between wears, and a simple clothes brush is better than washing it every time it picks up a little lint. Fold heavier pieces rather than hanging them, since the hanger will slowly pull the shoulder out of shape. My favourite way to wear the louche version is with one button done at the waist and the rest left open. It looks relaxed, but the proportion is doing the work. Keep the drama in one cardigan and the rest of the outfit calm.

Phoebe